Improvement in swivels for temper-screws



LGRAHAMf Swivel for Temper Screws.

No. 101,726. l Famed Apri112, 1870.

" linitrll vtatw aient @Mitte Letters Patent N 101,726, dated April 12,1870.

IMPROVEMENT IN SWIVELS FOR TEMPER-SCREWS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom z't mail concern.-

Y Be it known that I, THOMAS GRAHAM, of Shamburg, in the county of Venango and State of Pennsylvania, have invented a certain new and improved Swivel for Temper-screws, 85e., to be used in drilling artesian wells; and I do hereby declare that the following is a full, clear, and exact description thereof', reference being had to the annexed drawings making a, part of this specification. v

Similar letters indicate similar parts in all the views.

:In the drawings- Figure 1 represents a temper-screw, of the kind .ordinarily used, land provided wit-h the usual swivel at its upper end.

, ln drilling artesian wells, the drilling-tools are suspended from the working-beam in the manner shown in tig. 1, the temper-screw (consisting mainly of the bars A A, screw B, and swivel) is attached to a hook upon the outer end of the working-beam O, and the cable, carrying the tools, is attached to .the' lower end of said temper-screw.

As the drilling progresses, the bit is turned by revolving the entire temper-screw upon tlie swivel shown at its upper end, and the tools are lowered slowly by means of the screw.

'lhe cable and tools usually weigli from one to two thousand pounds, and a great amount of f iic-ton and wea-r occurs at the swivel, under the almost constant motion ofthe tools for months at a time.

The ohjectot' my invention is to produce a swivel which shall be as freefrom friction and consequent wear as possible, while it shall be simple, not liable .to getout of order, and produced at a reasonable cost.

Figure 2 is a vertical section of my improved swivel, and

Figure 3, a horizontal section taken on line A B.

a is the loop or hook, which is attached to the hook upon the-workingbean1,and upon the lower end ot' which a cylindrical box, b, is provided. A hole is drilled through the bottom of this box for the reception of the upper end or spindle c ofthe bars A A, which are forged and turned into the form shown. Said spindle is then provided with'an annular cap, d,

fitting loosely within the box l), and secured to tho spindle by means of the nut e.

]V also provide and insert three or more metal balls or rolls ff between the parallel surfaces of' the bottoni ofthe box b and cap ll.

"hen the whole is put together, as shown intig. 2, it will be seen 'that any weight suspended from the temper-screw is born by or upon the balls ff, the. cap 1,'and box b.

Inmost cases I prefer to make said balls and the wearing-surfaces otl the box and cap of steel, or ol' case-hardened metal, but in light work this may not be'necessary. Y

The ballsff present so little weariiig-suriace that the usual strain, wear, and friction are almost entire] y,

obviated, and the tools may be turned much more easily than by the use of the ordinary swivel yshown in tig. 1. My peculiar arrangement otI swivel may be applied and used wit-h equal advantage in all cases Where it becomes necessary to suspend and revolve 4heavy weights, as in the cranes used for carrying and trans.- ferring heavy articles in fonnderies, niachine-sl1ops, stone-yards, &o., in which casel a hook or loop may be forged u pon the lower end ot' the spindle c, or the whole swivel may -be inverted, it' desirable, for yany reason. Y I

Having thns'descrihed my improvements,

What I claim as my invention, and desire to secure by Letters Patent, is'

1. The described arrangement and combination of Witnesses:

WM. H. Connu., Wit. H. MCKENZIE. 

